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Game runs fine in low settings, I don't get any lags whatsoever, but when I am opening rune pages/champion selection/Masteries, it takes a while to load.
I also noticed LoL client uses 90-100% of my CPU when I have it opened (I suppose that is the reason for these lags)

As for the rune pages and other information in the PvP.net portion of the client, your PC should handle it just fine. But you have to remember that the information in these sections is not stored on your computer, but rather on a remote server. So if you have 100's of runes your PC has to download all of the information before the rune page can even load correctly.

As for overall performance you can expect it to be above normal during beta. Not all of the code optimizations have been put into place as of yet. As the game gets closer and closer to release to overhead required by the game will be reduced.

Well, it actually lags in general.I suppose I didn't make it clear enough.

For example client starts freezing when I enter my name/PW and login during that blue circle animation.I get like 5fps max during that time.Same thing in the whole client while navigating through the menus.